818 THE VOYAGE OF H.M.S. CHALLENGER. 



Subgenus 1. Oro2:>hasparium, Haeckel. 

 Definition. — Free apophyses of the radial spines simple, not branched. 



1. Orophaspis astrolonche, n. sp. 



Parmal pores of the shell circular, twice as large as the siitural pores and as the hreadth of the 

 bars. Eadial spines very long, three to six times as long as the diameter of the shell, compressed, 

 two-edged ; each with two simple, opposite, triangular apophyses ; their distance from the shell 

 equal to its diameter. 



Dimensions. — Diameter of the shell 0'05, parmal pores 0"004, sutural pores 0-002. 



Habitat. — North Pacific, Station 239, surface. 



2. Orophaspis gladiata, n. sp. 



Parmal pores of the shell circular, of the same size as the sutural pores and the bars. Eadial 

 spines thick, spindle-shaped, scarcely longer than the diameter of the shell, each with two simple 

 opposite conical apophyses ; their distance from the shell about equal to its radius. 



Dimensions. — Diameter of the shell 0"06, pores 0'003. 



Habitat. — Central Pacific, Station 265, surface. 



Subgenus 2. Orophaspidium, Haeckel. 



Definition. — Free apophyses of the radial spines branched, their branches free (not 

 anastomosing). 



3. Ovophaspis furcata, n. sp. (PI. 133, fig. 6). 



Parmal pores of the shell roundish or elliptical, three times as broad as the sutural pores and 

 the liars. Eadial spines very long, compressed, each with two opposite apophyses, which are simply 

 forked ; their distance from the shell somewhat greater than its diameter. 



Dimensions. — Diameter of the shell 0-06 to 0-08, parmal pores 0'006, sutural pores 0'002. 



Habitat. — Central Pacific, Station 274, surface, 



4. Orophaspis ramosa, n. sp. 



Parmal pores of the shell circular, of the same size as the sutural pores and the bars. Eadial 

 spines compressed, very long, each with two opposite apophyses, which are more or less irregularly 

 branched (commonly between eight and twelve thin branches on each spine); their distance from 

 the shell smaller than its diameter. 



Dimensions. — Diameter of the shell 0'08, pores O^OOG. 



Habitat. — North- West Pacific, Station 235, surface. 



